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This question was inspired by comments on this question: "Does the Robe of Eyes extend your vision while on the Ethereal Planes?".

Page 48 of the DMG states:

The Ethereal Plane is a misty, fog-bound dimension...
Visibility in the Border Ethereal is limited to 60 feet. The plane's depths comprise a region of swirling mist and fog called the Deep Ethereal, where visibility is limited to 30 feet.

It doesn't say anything about visibility into the Border Ethereal or into the Deep Ethereal.

The see invisibility spell states:

For the duration, you see invisible creatures and objects as if they were visible, and you can see into the Ethereal Plane...

However, it does not states how far into the Ethereal Plane you can see unlike every other method I can find (the Robe of Eyes, the true seeing spell, even monsters with Truesight).

How much of the Ethereal Plane does see invisibility allow you to see?

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As far as I can tell, if you're currently on the Material Plane or an Inner Plane and you cast see invisibility, you see everything that's in the Ethereal Plane that's within "line of sight" to you. The general description of the Ethereal Plane from the Basic Rules says that

The Ethereal Plane is a misty, fog-bound dimension that is sometimes described as a great ocean. Its shores, called the Border Ethereal, overlap the Material Plane and the Inner Planes, so that every location on those planes has a corresponding location on the Ethereal Plane. Certain creatures can see into the Border Ethereal, and the see invisibility and true seeing spell grant that ability.

So it specifically calls out that you can see into the Border Ethereal using see invisibility, and the spell itself just says that you can "see into it". I'm certainly making some assumptions here, but my ruling would be that you see the "corresponding" locations in the Ethereal Plane just like you would by looking anywhere else. That is, I don't see anywhere any particular limit to the range. The only difference between seeing things on the plane you're currently on and seeing what's on the matching location in the Ethereal is that "Ethereal creatures and objects appear ghostly and translucent." If you're outside in broad daylight, you could see pretty far, though maybe it becomes harder to pick out something ghostly and translucent from far away. If you're inside, you probably wouldn't see something on the other side of an opaque wall, just because it blocks your view past it.

Certainly I would understand some other DM ruling differently, especially as these details of how the multiverse is put together are designed to be somewhat customized by each DM. (Chapter 2 of the DMG is literally titled "Creating a Multiverse", after all.) But unless there's clearer guidance elsewhere I'm missing, that's the best by-the-book answer I see.

If you're not on the Material Plane or an Inner Plane when you cast see invisibility, you're pretty much on your own for that one. I have no idea what part of the Ethereal Plane you might see, if any.

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    \$\begingroup\$ For what it's worth, the spell does definitely let you see invisible things at arbitrary distances (subject to the same limitations as visible things), so I suppose it's not so unreasonable that it does likewise for ethereal things. \$\endgroup\$ – Ryan C. Thompson Aug 24 at 5:50

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